Search results for "Electric form factor"
showing 2 items of 22 documents
Mami Experimental Activity
1992
The Mainz Microtron MAMI is shortly described followed by a sketch of the three main experimental facilities: the Al collaboration realizing a 3-spectrometer set-up, the A2 collaboration realizing a photon tagger together with numerous dedicated detectors, and the A3 collaboration realizing a facility to use polarized electrons and polarized targets for the measurement of the electric form factor of the neutron G e,n. The physics program of the first round is outlined by listing all planned experiments.
Nucleon andΔ(1232)form factors at low momentum transfer and small pion masses
2012
An expansion of the electromagnetic form factors of the nucleon and $\ensuremath{\Delta}(1232)$ in small momentum transfer and pion mass is performed in a manifestly covariant EFT framework consistent with chiral symmetry and analyticity. We present the expressions for the nucleon and $\ensuremath{\Delta}(1232)$ electromagnetic form factors, charge radii, and electromagnetic moments in the framework of $SU(2)$ baryon chiral perturbation theory, with nucleon and $\ensuremath{\Delta}$-isobar degrees of freedom, to next-to-leading order. Motivated by the results for the proton electric radius obtained from the muonic-hydrogen atom and electron-scattering process, we extract values for the seco…